SB20260928375 - Missing Release of Resource after Effective Lifetime in Linux kernel smb client

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-97557)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper reference count management in cifs_queue_oplock_break() when queueing oplock-break work. A remote attacker can trigger repeated oplock breaks while prior work remains queued to cause a denial of service.

The issue can be triggered when interacting with a slow-responding server.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2ed2c29dd9593637cfa25ac1eb23241b20202778
• https://git.kernel.org/stable/c/9f2e63f1b2d5fc5b5423424902c091123e220e7e
• https://git.kernel.org/stable/c/af0193bbf1ac8c0f67f972998b0cc629d6116cf6
• https://git.kernel.org/stable/c/dfe7b750c7e069873a8a57a11c816831a235618a